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Effect of molybdenum content on phase transformations in binary Ti-Mo alloys
Valešová, Veronika ; Stráský, Josef (advisor) ; Janeček, Miloš (referee)
Title: Effect of molybdenum content on phase transformations in binary Ti-Mo alloys Author: Veronika Valešová Department: Department of Physics of Materials Supervisor: PhDr. RNDr. Josef Stráský, Ph.D., Department of Physics of Mate- rials Abstract: β titanium alloys are highly appreciated group of structural materials. They provide an extraordinary combination of strength, toughness and fatigue resistance. These alloys are used predominantly in aerospace sector, chemical industry and medical engineering. We have studied three binary titanium alloys: Ti-12Mo, Ti-15Mo and Ti-18Mo (wt %). Apart from low temperature hexagonal close packed α phase and high temperature base centered cubic β phase, a metastable ω phase can be also found in this type of alloys. The ω phase is created in a diffusionless process by shifting the planes in the β phase and affects both mechanical properties and the α phase precipitation. We have examined the phase transformations occurring in the studied alloys using both in-situ and ex-situ methods. Resistometry, dilatometry and differential scanning calorimetry were used as the indirect in-situ methods. For the ex-situ methods, scanning electron microscopy and microhardness measurement were used. Complex characterization of β metastable titanium alloys showed the formation of the...
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Complex investigation of fine-grained polycrystals of Cu and CuZr alloy processed by equal channel angular pressing a high pressure torsion
Srba, Ondřej ; Janeček, Miloš (advisor) ; Hadzima, Branislav (referee) ; Karlík, Miroslav (referee)
Title: Complex investigation of fine-grained polycrystals of Cu and CuZr alloy processed by equal channel angular pressing and high pressure torsion Author: RNDr.Ondřej Srba Department: Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University Prague Supervisor: Doc. RNDr. Miloš Janeček, CSc. Abstract: In the thesis the microstructure development, mechanical, elastic and corrosion properties of deformed specimens of pure Cu and binary alloy CuZr processed by equal channel angular pressing (ECAP) are investigated. Several properties of pure Cu processed by ECAP are compared with properties of the same material processed by high pressure torsion (HPT). The microstructure development is characterized in detail by several experimental techniques (light and electron microscopy, electron back scatter diffraction, positron annihilation spectroscopy, etc.). The microstructure development in specimens processed by ECAP is characterized by the continuous fragmentation of the initial coarse grain structure and the formation of new grains having the sizes in the submicrocrystalline range (of 460 nm and 260 nm in Cu and CuZr alloy, respectively). During the deformation by ECAP the fraction of high-angle grain boundaries, the dislocation density and the concentration of vacancies are...
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Acceleration of calculations in life insurance
Kuzminskaya, Kseniya ; Janeček, Martin (advisor) ; Vitali, Sebastiano (referee)
One of the major issues in practical calculation in life insurance - typically value of liabilities, value of the company, pricing,... - is that the calculations run times are very long. This work should investigate possible approaches how to speed up the calculation (cluster analysis, flexing,...). If the results are positive, it can have crucial practical applications 1
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Self-study language learning software for upper-intermediate (B2) adult learners of English: do existing products meet the requirements?
Janeček Keller, Maurice ; Mothejzíková, Jarmila (advisor) ; Klégr, Aleš (referee)
This thesis examines comprehensive self-study software packages for upper-intermediate (B2) learners of English, in the context of adult language learning and computer-assisted language learning. The aim is to provide a holistic perspective. To determine whether contemporary self-study software is likely to deliver on its producers' promises, a list of evaluation criteria is elaborated and used to evaluate the newest versions of four products that are available on the Czech software market: Anglicky efektivne a Anglicka gramatika by the Czech company Landi, Anglictina Elements pro sti'edne pokroCile by Langmaster Intemational which is a Czech based company as well, Tell Me More Anglictina 3 by the French company Auralog and adapted for Czech leamers by the Czech publishing house Leda, and finally Rosetta Stone U.K. English Level 3 by the American company Fairfield Language Technologies. In addition to the theoretical evaluation, one ofthe products (Tell Me More) was subjected to a one-month trial in an authentic context. Although, each program has its strong points, it is pointed out that success can not be expected from leaming that relies exclusively on these self·study materials. The thesis concludes by proposing improvements with which learning software could be successfully used in self-study settings...
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Money Laundering
Janeček, Miroslav ; Kohajda, Michael (advisor) ; Kotáb, Petr (referee)
Money laundering can be defined as a process of converting the proceeds of illegal activities to legitimate money or other assets, or as a process whose aim is to conceal the origin and ownership of proceeds that come from illegal activities. Its main phases are placement, layering and integration. The main sources of dirty money are drug trafficking, procuring, arms trafficking, extortion, robbery and property crimes. The aim of this thesis is the analysis of the fight against money laundering in terms of financial law and from institutional point of view, evaluation of its success and the formulation of my own opinions on the possible improvement of the system components. The first part of thesis deals with the term of money laundering, its phases and characteristics and history. The second part analyses the legislation at international, EU and national level. Attention is paid to the AML Directives and to the AML Act. Main obligations prescribed by Directives and AML Act to obliged persons are identification obligation, due diligence, preservation of information, reporting of suspicious transactions, postponement of client's order, creation of internal policies and staff training. Then follows characterization of individual authorities and institutions involved in combating money laundering....
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Interaction of tokamak plasma with selected fusion materials
Klevarová, Veronika ; Janeček, Miloš (advisor) ; Horáček, Jan (referee)
Title: Interaction of tokamak plasma with selected fusion materials Author: Veronika Klevarová Department: Department of Physics of Materials Supervisor: Doc. RNDr. Miloš Janeček, CSc. Supervisor's e-mail address: Milos.Janecek@mff.cuni.cz Abstract: The following work is devoted to structural analysis and study of relevant physical properties of materials with perspective use for the first wall and as construction materials of the tokamak device, prior to their interaction with the high-temperature plasma in Compass-D tokamak. The theoretical part contains an introduction to the interaction of tokamak plasma with fusion materials, including a description of the processes taking place during the plasma discharge (such as implantation, erosion, particles traveling in the tokamak vacuum vessel, redeposition, co-deposition with tritium etc.) and selection of appropriate fusion materials. The experimental part consists of structural analysis of selected materials by optical and scanning electron microscopy. Analysis of the structure revealed the presence of oxide layers in some samples prepared by the technology of plasma spraying; which was probably caused by sample preparation in the ambient air. Qualitative elemental analysis of the samples was performed by electron dispersive X-ray spectroscopy (EDS) in SEM....
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